31916589 has 16 divisors (see below), whose sum is σ = 43662528. Its totient is φ = 20731392.

The previous prime is 31916579. The next prime is 31916593. The reversal of 31916589 is 98561913.

It is not a de Polignac number, because 31916589 - 2⁷ = 31916461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31916589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31916509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18679 + ... + 20315.

It is an arithmetic number, because the mean of its divisors is an integer number (2728908).

Almost surely, 2^31916589 is an apocalyptic number.

It is an amenable number.

31916589 is a deficient number, since it is larger than the sum of its proper divisors (11745939).

31916589 is a wasteful number, since it uses less digits than its factorization.

31916589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its digits is 58320, while the sum is 42.

The square root of 31916589 is about 5649.4768784375. The cubic root of 31916589 is about 317.2041230613.

The spelling of 31916589 in words is "thirty-one million, nine hundred sixteen thousand, five hundred eighty-nine".